Epdcch Common Search Space Design for One or More Carrier Types

1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising: receiving first information, wherein the first information indicates a first type common search space (CSS) of a channel, and wherein the channel is an enhanced physical downlink control channel; receiving second information, wherein the second information is received via the first type CSS; determining, from the second information that is received via the first type CSS, a first type downlink control information (DCI) and a system information; determining, from the system information, a second type CSS of the channel; receiving third information, wherein the third information is received via the second type CSS; and determining, from the third information that is received via the second type CSS, a second type DCI.

2. The method of claim 1 , further comprising receiving the first information via a Master Information Block (MIB).

3. The method of claim 1 , further comprising: receiving a demodulation reference signal (DM-RS) sequence associated with the channel, and initializing the DM-RS sequence for one or more of the common search spaces using physical cell identifier parameters.

4. The method of claim 1 , further comprising monitoring one or more of the common search spaces for one or more two-dimensional enhanced control channel elements (eCCEs) over at least two consecutive subframes at an aggregation level.

5. The method of claim 1 , wherein the first type DCI is scrambled with a System Information Radio Network Temporary Identifier (SI-RNTI).

6. The method of claim 1 , wherein the second type DCI is scrambled with a Random Access Radio Network Temporary Identifier (RA-RNTI) or a Paging Radio Network Temporary Identifier (P-RNTI).

7. The method of claim 1 , wherein the first information comprises a frequency location of the first type CSS.

8. The method of claim 1 , further comprising using at least one of the first type DCI or the second type DCI.

9. A wireless transmit/receive unit (WTRU), comprising: a memory; a receiver; and a processor, configured at least to: receive first information, wherein the first information indicates a first type common search space (CSS) associated with a channel, and wherein the channel is an enhanced physical downlink control channel; receive second information, wherein the second information is received via the first type CSS; determine, from the second information that is received via the first type CSS, a first type downlink control information (DCI) and a system information; determine, from the system information, a second type CSS associated with the channel; receive third information, wherein the third information is received via the second type CSS; and determine, from the third information that is received via the second type CSS, a second type DCI.

10. The WTRU of claim 9 , wherein the processor is further configured to receive the first information via a Master Information Block (MIB).

11. The WTRU of claim 9 , wherein the processor is further configured to: receive a demodulation reference signal (DM-RS) sequence associated with the channel, and initialize the DM-RS sequence for one or more of the common search spaces using physical cell identifier parameters.

12. The WTRU of claim 9 , wherein the processor is further configured to monitor one or more of the common search spaces for one or more two-dimensional enhanced control channel elements (eCCEs) over at least two consecutive subframes at an aggregation level.

13. The WTRU of claim 9 , wherein the first type DCI is scrambled with a System Information Radio Network Temporary Identifier (SI-RNTI).

14. The WTRU of claim 9 , wherein the second type DCI is scrambled with a Random Access Radio Network Temporary Identifier (RA-RNTI) or a Paging Radio Network Temporary Identifier (P-RNTI).

15. The WTRU of claim 9 , wherein the first information comprises a frequency location of the first type CSS.

16. The WTRU of claim 9 , wherein the processor is further configured to use at least one of the first type DCI or the second type DCI.